An online production sandstone moisture content automatic monitoring device

Abstract

The present application belongs to the technical field of sand and gravel moisture content detection, and particularly relates to an online sand and gravel moisture content automatic monitoring device, which comprises a material guide groove plate, a control module and a display device, the outer wall of the display device is fixedly connected with the outer wall of the material guide groove plate, the lower surface of the material guide groove plate is fixedly connected with a plurality of supporting legs, the outer walls of the plurality of supporting legs are jointly fixedly connected with a supporting plate, the lower surface of the material guide groove plate is provided with a through hole, and the hole wall of the through hole is fixedly connected with a monitoring cylinder. The online sand and gravel moisture content automatic monitoring device has the ability of monitoring end safety protection, thereby the reliability and service life of the automatic detection device can be improved, and the sand and gravel moisture content automatic monitoring device also has the functions of monitoring end cleaning and drying, which can avoid the interference of water in the sand and gravel before the device monitoring end to the subsequent sand and gravel moisture content monitoring, and effectively improve the accuracy of the monitoring device to the sand and gravel moisture content monitoring result.

Description

Technical Field

[0001] This invention belongs to the field of sand and gravel moisture content detection technology, and in particular relates to an automatic monitoring device for the moisture content of sand and gravel produced online. Background Technology

[0002] Sand and gravel refer to a loose mixture of sand and gravel, which is the main material of building concrete. Moreover, sand and gravel aggregates from different mining environments have different moisture contents. If the moisture content of sand and gravel aggregates is too high, the final concrete mix will be too thin, affecting the quality of the concrete. If the moisture content of sand and gravel aggregates is too low, the final concrete mix will require frequent addition of water to dilute it. Therefore, during the production process, the moisture content of sand and gravel aggregates is often monitored online in real time through monitoring equipment to ensure the quality of concrete made with sand and gravel aggregates.

[0003] Currently, online automatic detection of moisture content in sand and gravel production is generally accomplished using humidity measuring instruments. These instruments are mounted on a frame above the sand and gravel conveyor belt, with their monitoring end inserted into the sand and gravel. However, this method suffers from significant impact and wear on the monitoring end of the instrument due to the sand and gravel, which can easily damage the instrument. Furthermore, this method suffers from poor accuracy during continuous monitoring. For example, when switching from high-moisture-content sand and gravel to low-moisture-content sand and gravel, the surface of the measuring end of the humidity measuring instrument is coated with a significant amount of moisture from the high-moisture-content sand and gravel. This results in moisture content monitoring errors when monitoring low-moisture-content sand and gravel, affecting not only the accuracy of the online automatic moisture content monitoring device but also its reliability and lifespan.

[0004] To address this issue, we propose an online automatic monitoring device for the moisture content of sand and gravel. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing an automatic monitoring device for the moisture content of sand and gravel produced online.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an online sand and gravel moisture content automatic monitoring device, comprising a feed trough plate, a control module, and a display device. The outer wall of the display device is fixedly connected to the outer wall of the feed trough plate. Multiple support legs are fixedly connected to the lower surface of the feed trough plate, and a support plate is fixedly connected to the outer walls of the multiple support legs. A through hole is formed on the lower surface of the feed trough plate, and a monitoring cylinder is fixedly connected to the wall of the through hole. A sealing sleeve is movably connected to the inner wall of the monitoring cylinder. A wedge-shaped push block is fixedly connected to the inner wall of the sealing sleeve. An annular cavity is formed inside the wedge-shaped push block, and multiple exhaust bends are formed inside the wedge-shaped push block. The bottom ends of the multiple exhaust bends are fixedly connected to the cavity wall of the annular cavity, and the top ends of the exhaust bends are connected to... The square hole has a continuous wall. The lower surface of the wedge-shaped pusher has a square hole, and a rectangular tube is movably connected to the wall of the square hole. The bottom end of the rectangular tube is fixedly connected to the inner wall of the monitoring tube. The lower surface of the monitoring tube has two round holes, and the walls of the round holes are fixedly connected to rubber sealing rings. The inner walls of the two rubber sealing rings are fitted with a U-shaped steel tube. The top end of the U-shaped steel tube passes through the bottom end of the wedge-shaped pusher and communicates with the annular cavity. The four outer walls of the rectangular tube have mounting holes, and the walls of the mounting holes are fixedly connected to a moisture content monitoring mechanism. The lower surface of the monitoring tube is fixedly connected to a reciprocating mechanism. The outer wall of the monitoring tube is fixedly connected to a cleaning mechanism. The bottom outer wall of the monitoring tube is fixedly connected to a control mechanism. The outer wall of the control module is fixedly connected to the outer wall of the monitoring tube.

[0007] In the above-mentioned online sand and gravel moisture content automatic monitoring device, the moisture content monitoring mechanism includes an insulating shell fixedly connected to the inner wall of the mounting hole on the rectangular tube, a moisture-sensing membrane assembly fixedly connected to the outer wall of the insulating shell, a positive electrode plate and a negative electrode plate connected to the inner wall of the moisture-sensing membrane assembly, and both ends of the positive electrode plate and the negative electrode plate passing through the outer wall of the insulating shell.

[0008] In the above-mentioned online sand and gravel moisture content automatic monitoring device, an insulating sheet is connected to the side of the positive electrode plate adjacent to the negative electrode plate, and the inner wall of the outer wall insulating shell of the insulating sheet is fixedly connected.

[0009] In the above-mentioned online sand and gravel moisture content automatic monitoring device, the reciprocating mechanism includes a motor fixedly connected to the lower surface of the monitoring cylinder, a reciprocating screw fixedly connected to the output end of the motor, a nut threaded onto the rod wall of the reciprocating screw, the outer wall of the nut fixedly connected to the outer wall of the U-shaped steel pipe, and an anti-detachment block fixedly connected to the bottom end of the reciprocating screw.

[0010] In the above-mentioned online sand and gravel moisture content automatic monitoring device, the cleaning mechanism includes a hollow block fixedly connected to the outer wall of the monitoring cylinder. A micro air pump is fixedly connected to the upper surface of the hollow block. The output end of the micro air pump passes through the inner wall of the hollow block. A heat-conducting ventilation block is fixedly connected to the inner wall of the hollow block. A through hole is opened on the outer wall of the hollow block, and an electric heating tube is fixedly connected to the wall of the through hole. The bottom end of the electric heating tube contacts the upper surface of the heat-conducting ventilation block. A flexible hose is fixedly connected to the bottom end of the hollow block, and the bottom end of the flexible hose is fixedly connected to the outer wall of the hollow steel pipe.

[0011] In the above-mentioned online sand and gravel moisture content automatic monitoring device, the control mechanism includes an air inlet cylinder fixedly connected to the bottom side wall of the monitoring cylinder. An air inlet one-way valve is fixedly connected to the outer wall of the side end of the air inlet cylinder. An exhaust hole is opened on the outer wall of the air inlet cylinder. A fixing hole and a connecting hole are opened on the outer wall of the air inlet cylinder. A conductive block and a conductive rod are respectively connected to the hole walls of the fixing hole and the connecting hole. An energizing block is fixedly connected to the side end of the conductive rod. An insulating spring is sleeved on the rod wall of the conductive rod.

[0012] In the above-mentioned online sand and gravel moisture content automatic monitoring device, the wedge-shaped pusher has a guide groove on its upper surface at the square hole, and the groove wall of the guide groove is fixedly connected with a cleaning soft brush layer.

[0013] In the above-mentioned online sand and gravel moisture content automatic monitoring device, the conductive rod is sleeved with a rubber ring, the outer wall of the rubber ring is fixedly connected to the outer wall of the energized block, and the outer wall of the rubber ring is slidably connected to the inner wall of the air inlet cylinder.

[0014] Compared with existing technologies, the advantages of an online automatic monitoring device for the moisture content of sand and gravel production are:

[0015] 1. By using a monitoring cylinder, moisture content monitoring mechanism, reciprocating mechanism, and wedge pusher, when moisture content needs to be monitored during sand and gravel production, the motor of the reciprocating mechanism is first started. The motor causes the wedge pusher to move downward through the reciprocating mechanism and U-shaped steel pipe. At this time, part of the sand and gravel on the guide chute falls into the monitoring cylinder. Finally, the sand and gravel wrap around the moisture content monitoring mechanism on the rectangular cylinder, changing the way sand and gravel moisture content is monitored online. This avoids the impact and wear of the monitoring end of the monitoring device by the conveyed sand and gravel. Moreover, multiple moisture content monitoring mechanisms monitor simultaneously, and the results are displayed in real time through the control module and display device, thereby ensuring the accuracy of the moisture content monitoring results and reducing monitoring errors. This mechanism enables the sand and gravel online automatic moisture content monitoring device to have the ability to protect the monitoring end, thereby improving the reliability and lifespan of the automatic detection device.

[0016] 2. Through the established cleaning mechanism, control mechanism, annular cavity, and exhaust bend, when the moisture content of sand and gravel has been detected by the moisture content monitoring mechanism and the next batch of sand and gravel needs to be monitored again, the reciprocating mechanism pushes the wedge-shaped pusher upward, the cleaning soft brush layer cleans the surface of the rectangular cylinder, and at the same time, air enters the monitoring cylinder through the air inlet cylinder and one-way air inlet valve of the control mechanism. The control mechanism controls the micro air pump and electric heating tube to work. Finally, the cleaning mechanism delivers hot air and discharges it from the exhaust bend. When the exhaust bend moves to the moisture-sensing membrane component of the moisture content monitoring mechanism, the hot air can not only clean the sand and gravel on the surface of the moisture-sensing membrane component, but also dry the surface of the moisture-sensing membrane component, so as to avoid the moisture adhering on the surface of the moisture-sensing membrane component from interfering with the subsequent accurate monitoring of the moisture content of sand and gravel. This mechanism enables the automatic monitoring device of sand and gravel moisture content to have the function of cleaning and drying at the monitoring end, avoiding the interference of the moisture in the sand and gravel in the previous monitoring end on the subsequent monitoring of the moisture content of sand and gravel, and effectively improving the accuracy of the monitoring device's monitoring results of sand and gravel moisture content. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an online sand and gravel moisture content automatic monitoring device provided by the present invention;

[0018] Figure 2 This is a partially enlarged structural schematic diagram of an online sand and gravel moisture content automatic monitoring device provided by the present invention;

[0019] Figure 3 This is a schematic diagram of the moisture content monitoring mechanism in an online sand and gravel moisture content automatic monitoring device provided by the present invention;

[0020] Figure 4 This is a schematic diagram of the control mechanism in an online sand and gravel moisture content automatic monitoring device provided by the present invention;

[0021] Figure 5 for Figure 2 A magnified diagram of the top structure.

[0022] In the diagram: 1. Feed trough plate; 2. Control module; 3. Display device; 4. Support leg; 5. Support plate; 6. Control mechanism; 61. Air inlet cylinder; 63. Exhaust hole; 64. Conductive block; 65. Conductive rod; 66. Power block; 67. Insulating spring; 7. Moisture content monitoring mechanism; 71. Insulating shell; 72. Moisture-sensing membrane assembly; 73. Positive electrode plate; 74. Negative electrode plate; 8. Reciprocating mechanism; 81. Motor; 82. Reciprocating screw; 83. Nut; 84. Anti-detachment block; 9. Cleaning mechanism; 91. Hollow block; 92. Miniature air pump; 93. Heat-conducting ventilation block; 94. Electric heating tube; 95. Hose; 10. Sealing sleeve; 11. Wedge-shaped push block; 12. Annular cavity; 13. Exhaust bend; 14. Rectangular cylinder; 15. Rubber sealing ring; 16. U-shaped steel pipe; 17. Monitoring cylinder; 18. Insulating sheet; 19. Cleaning soft brush layer; 20. Rubber ring. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1-5 As shown, an online automatic monitoring device for the moisture content of sand and gravel includes a feed trough 1, a control module 2, and a display device 3. The control module 2 is an 80C51 microcontroller. The outer wall of the display device 3 is fixedly connected to the outer wall of the feed trough 1. Multiple support legs 4 are fixedly connected to the lower surface of the feed trough 1, and a support plate 5 is fixedly connected to the outer wall of the multiple support legs 4. A through hole is opened on the lower surface of the feed trough 1, and a monitoring cylinder 17 is fixedly connected to the wall of the through hole. A sealing sleeve 10 is movably connected to the inner wall of the monitoring cylinder 17. A wedge-shaped pusher 11 is fixedly connected to the inner wall of the sealing sleeve 10. An annular cavity 12 is opened inside the wedge-shaped pusher 11, and multiple exhaust bends 13 are opened inside the wedge-shaped pusher 11. The bottom of the multiple exhaust bends 13... All ends are fixedly connected to the cavity wall of the annular cavity 12. The top end of the exhaust bend 13 is connected to the hole wall of the square hole. The lower surface of the wedge-shaped push block 11 is provided with a square hole, and the hole wall of the square hole is movably connected to a rectangular cylinder 14. The upper surface of the wedge-shaped push block 11 located at the square hole is provided with a guide groove, and the groove wall of the guide groove is fixedly connected to a cleaning soft brush layer 19. The cleaning soft brush layer 19 can clean the surface of the rectangular cylinder 14. The bottom end of the rectangular cylinder 14 is fixedly connected to the inner wall of the monitoring cylinder 17. The lower surface of the monitoring cylinder 17 is provided with two round holes, and the hole wall of the round holes is fixedly connected to a rubber sealing ring 15. The inner walls of the two rubber sealing rings 15 are jointly fitted with a U-shaped steel pipe 16. The top end of the U-shaped steel pipe 16 passes through the bottom end of the wedge-shaped push block 11 and is connected to the annular cavity 12.

[0025] The rectangular tube 14 has mounting holes on all four outer walls, and a moisture content monitoring mechanism 7 is fixedly connected to the wall of the mounting hole. The moisture content monitoring mechanism 7 includes an insulating shell 71 fixedly connected to the inner wall of the mounting hole on the rectangular tube 14. A moisture-sensing membrane assembly 72 is fixedly connected to the outer wall of the insulating shell 71. A positive electrode plate 73 and a negative electrode plate 74 are connected to the inner wall of the moisture-sensing membrane assembly 72. Both ends of the positive electrode plate 73 and the negative electrode plate 74 pass through the outer wall of the insulating shell 71. This mechanism can realize automatic moisture content monitoring. An insulating sheet 18 is connected to the side of the positive electrode plate 73 and the negative electrode plate 74 adjacent to each other. The outer wall of the insulating sheet 18 is fixedly connected to the inner wall of the insulating shell 71. The insulating sheet 18 can prevent the positive electrode plate 73 and the negative electrode plate 74 from accidentally touching each other and short-circuiting and being damaged.

[0026] A reciprocating mechanism 8 is fixedly connected to the lower surface of the monitoring cylinder 17. The reciprocating mechanism 8 includes a motor 81 fixedly connected to the lower surface of the monitoring cylinder 17. A reciprocating screw 82 is fixedly connected to the output end of the motor 81. A nut 83 is threaded onto the rod wall of the reciprocating screw 82. The outer wall of the nut 83 is fixedly connected to the outer wall of the U-shaped steel pipe 16. An anti-detachment block 84 is fixedly connected to the bottom end of the reciprocating screw 82. This mechanism can realize the up and down movement of the wedge-shaped pusher 11 and can change the way the online moisture content of sand and gravel is monitored, thereby protecting the monitoring end of the monitoring device.

[0027] A cleaning mechanism 9 is fixedly connected to the outer wall of the monitoring cylinder 17. The cleaning mechanism 9 includes a hollow block 91 fixedly connected to the outer wall of the monitoring cylinder 17. A micro air pump 92 is fixedly connected to the upper surface of the hollow block 91. The output end of the micro air pump 92 passes through the inner wall of the hollow block 91. A heat-conducting ventilation block 93 is fixedly connected to the inner wall of the hollow block 91. A through hole is opened on the outer wall of the hollow block 91, and an electric heating tube 94 is fixedly connected to the wall of the through hole. The bottom end of the electric heating tube 94 contacts the upper surface of the heat-conducting ventilation block 93. A flexible hose 95 is fixedly connected to the bottom end of the hollow block 91. The bottom end of the flexible hose 95 is fixedly connected to the outer wall of the hollow steel pipe. This mechanism enables the automatic sand and gravel moisture content monitoring device to have the function of cleaning and drying the monitoring end, avoiding the interference of the moisture in the sand and gravel before the device assists in monitoring the monitoring end on the subsequent sand and gravel moisture content monitoring, and effectively improving the accuracy of the monitoring device for sand and gravel moisture content monitoring results.

[0028] A control mechanism 6 is fixedly connected to the bottom outer wall of the monitoring cylinder 17. The outer wall of the control module 2 is fixedly connected to the outer wall of the monitoring cylinder 17. The control mechanism 6 includes an air inlet cylinder 61 fixedly connected to the bottom side wall of the monitoring cylinder 17. An air inlet one-way valve is fixedly connected to the side outer wall of the air inlet cylinder 61. An exhaust port 63 is opened on the outer wall of the air inlet cylinder 61. A fixing hole and a connecting hole are opened on the outer wall of the air inlet cylinder 61. A conductive block 64 and a conductive rod 65 are respectively connected to the hole walls of the fixing hole and the connecting hole. A rubber ring 20 is sleeved on the rod wall of the conductive rod 65. The outer wall of the rubber ring 20 is fixedly connected to the outer wall of the energized block 66. Next, the outer wall of the rubber ring 20 is slidably connected to the inner wall of the air inlet cylinder 61. The rubber ring 20 can prevent air from escaping from the air inlet cylinder 61 and thus prevent the energized block 66 from separating from the conductive block 64. The side end of the conductive rod 65 is fixedly connected to the energized block 66, and the rod wall of the conductive rod 65 is sleeved with an insulating spring 67. This mechanism can control the opening and closing of the micro air pump 92 and the electric heating tube 94 in the cleaning mechanism 9, improve the automation of the monitoring device, and thus improve the ease of use of the monitoring device. The electrical connection relationship of the above-mentioned electrical equipment is prior art and is known to those skilled in the art, and will not be described in detail here.

[0029] The operating principle of this invention is described as follows: When it is necessary to monitor the moisture content during the sand and gravel production process, the automatic moisture content monitoring device is first installed at the beginning or end of the sand and gravel conveying line. The sand and gravel fall onto the guide trough 1, and at the same time, the motor 81 of the reciprocating mechanism 8 is started. The motor 81 causes the reciprocating screw 82 to rotate. The reciprocating screw 82 moves the wedge-shaped pusher 11 downward through the nut 83 and the U-shaped steel pipe 16. At this time, part of the sand and gravel on the guide trough 1 falls into the monitoring cylinder 17. Finally, the sand and gravel wrap around the moisture content monitoring mechanism 7 on the rectangular cylinder 14, changing the online monitoring method of sand and gravel moisture content. The conductivity of the moisture-sensing membrane component 72 increases due to moisture, thereby reducing its resistance. The resistance change is transmitted to the control module 2 through the positive electrode plate 73 and the negative electrode plate 74, and is displayed in real time by the control module 2 and the display device 3. This avoids the impact and wear of the monitoring end of the monitoring device by the transported sand and gravel. Moreover, multiple moisture content monitoring mechanisms 7 monitor simultaneously, ensuring the accuracy of the moisture content monitoring results and reducing monitoring errors. This mechanism enables the online automatic moisture content monitoring device of sand and gravel to have the ability to protect the monitoring end, thereby improving the reliability and lifespan of the automatic detection device.

[0030] When the moisture content of the sand and gravel has been detected by the moisture content monitoring device 7 and the next batch of sand and gravel needs to be re-monitored, the motor 81 pushes the wedge-shaped pusher 11 upward through the reciprocating screw 82, nut 83, and U-shaped steel pipe 16. The cleaning soft brush layer 19 cleans the surface of the rectangular cylinder 14. At this time, air enters the monitoring cylinder 17 through the air inlet cylinder 61 and one-way air inlet valve of the control mechanism 6. At the same time, the insulating spring 67 pushes the rubber ring 20 to move. The rubber ring 20 makes the energized block 66 contact the conductive block 64. At this time, the micro air pump 92 and the electric heating tube 94 are energized and work. The electric heating tube 94 raises the temperature of the air delivered by the micro air pump 92 through the heat-conducting ventilation block 93. Finally, the hot air is delivered into the annular cavity 12 through the hose 95 and U-shaped steel pipe 16 and then through the exhaust bend. When the exhaust duct moves to the moisture-sensing membrane component 72 of the moisture content monitoring mechanism 7, the hot air can not only clean the sand and gravel on the surface of the moisture-sensing membrane component 72, but also dry the surface of the moisture-sensing membrane component 72, so as to avoid the moisture adhering to the surface of the moisture-sensing membrane component 72 from interfering with the accurate monitoring of the moisture content of the sand and gravel. After the wedge pusher 11 moves up, it pushes the previous sand and gravel onto the guide trough plate 1 for discharge. Then the wedge pusher 11 moves down again to monitor the moisture content of the next batch of sand and gravel. This mechanism enables the automatic sand and gravel moisture content monitoring device to have the function of cleaning and drying the monitoring end, avoiding the interference of the moisture in the previous sand and gravel on the subsequent sand and gravel moisture content monitoring, and effectively improving the accuracy of the monitoring device for sand and gravel moisture content monitoring results.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An online sand and gravel moisture content automatic monitoring device, comprising a feed trough (1), a control module (2), and a display device (3), characterized in that, The outer wall of the display device (3) is fixedly connected to the outer wall of the guide trough plate (1). Multiple support legs (4) are fixedly connected to the lower surface of the guide trough plate (1). The outer walls of the multiple support legs (4) are fixedly connected to a support plate (5). A through hole is opened on the lower surface of the guide trough plate (1), and a monitoring cylinder (17) is fixedly connected to the wall of the through hole. A sealing sleeve (10) is movably connected to the inner wall of the monitoring cylinder (17). A wedge-shaped push block (11) is fixedly connected to the inner wall of the sealing sleeve (10). An annular cavity (12) is opened inside the wedge-shaped push block (11). Multiple exhaust bends (13) are opened inside the wedge-shaped push block (11). The bottom ends of the multiple exhaust bends (13) are fixedly connected to the cavity wall of the annular cavity (12). The top end of the exhaust bends (13) is connected to the hole wall of the square hole. A square hole is opened on the lower surface of the wedge-shaped push block (11), and the hole of the square hole is... A rectangular tube (14) is movably connected to the wall. The bottom end of the rectangular tube (14) is fixedly connected to the inner wall of the monitoring tube (17). Two round holes are opened on the lower surface of the monitoring tube (17), and rubber sealing rings (15) are fixedly connected to the hole walls. A U-shaped steel pipe (16) is sleeved on the inner wall of the two rubber sealing rings (15). The top end of the U-shaped steel pipe (16) passes through the bottom end of the wedge-shaped push block (11) and communicates with the annular cavity (12). The four outer walls of the rectangular tube (14) are provided with installation holes, and the hole walls of the installation holes are fixedly connected to a moisture content monitoring mechanism (7). A reciprocating mechanism (8) is fixedly connected to the lower surface of the monitoring tube (17). A cleaning mechanism (9) is fixedly connected to the outer wall of the monitoring tube (17). A control mechanism (6) is fixedly connected to the bottom outer wall of the monitoring tube (17). The outer wall of the control module (2) is fixedly connected to the outer wall of the monitoring tube (17). The reciprocating mechanism (8) includes a motor (81) fixedly connected to the lower surface of the monitoring cylinder (17). The output end of the motor (81) is fixedly connected to a reciprocating screw (82). A nut (83) is threaded onto the rod wall of the reciprocating screw (82). The outer wall of the nut (83) is fixedly connected to the outer wall of the U-shaped steel pipe (16). An anti-detachment block (84) is fixedly connected to the bottom end of the reciprocating screw (82). The cleaning mechanism (9) includes a hollow block (91) fixedly connected to the outer wall of the monitoring cylinder (17). A micro air pump (92) is fixedly connected to the upper surface of the hollow block (91). The output end of the micro air pump (92) passes through the inner wall of the hollow block (91). A heat-conducting ventilation block (93) is fixedly connected to the inner wall of the hollow block (91). A through hole is opened on the outer wall of the hollow block (91), and an electric heating tube (94) is fixedly connected to the hole wall. The bottom end of the electric heating tube (94) contacts the upper surface of the heat-conducting ventilation block (93). A hose (95) is fixedly connected to the bottom end of the hollow block (91). The bottom end of the hose (95) is fixedly connected to the outer wall of the U-shaped steel pipe (16).

2. The online sand and gravel moisture content automatic monitoring device according to claim 1, characterized in that, The moisture content monitoring mechanism (7) includes an insulating shell (71) fixedly connected to the inner wall of the mounting hole on the rectangular tube (14). A moisture-sensing membrane assembly (72) is fixedly connected to the outer wall of the insulating shell (71). A positive electrode plate (73) and a negative electrode plate (74) are connected to the inner wall of the moisture-sensing membrane assembly (72). Both ends of the positive electrode plate (73) and the negative electrode plate (74) pass through the outer wall of the insulating shell (71).

3. The online sand and gravel moisture content automatic monitoring device according to claim 2, characterized in that, An insulating sheet (18) is connected to the side of the positive electrode sheet (73) adjacent to the negative electrode sheet (74), and the outer wall of the insulating sheet (18) is fixedly connected to the inner wall of the insulating shell (71).

4. The online sand and gravel moisture content automatic monitoring device according to claim 1, characterized in that, The control mechanism (6) includes an air inlet cylinder (61) that is fixedly connected to the bottom side wall of the monitoring cylinder (17). An air inlet one-way valve is fixedly connected to the outer wall of the side end of the air inlet cylinder (61). An exhaust hole (63) is opened on the outer wall of the air inlet cylinder (61). A fixing hole and a connecting hole are opened on the outer wall of the air inlet cylinder (61). A conductive block (64) and a conductive rod (65) are respectively connected to the hole walls of the fixing hole and the connecting hole. An electric block (66) is fixedly connected to the side end of the conductive rod (65). An insulating spring (67) is sleeved on the rod wall of the conductive rod (65).

5. The online sand and gravel moisture content automatic monitoring device according to claim 1, characterized in that, The wedge-shaped pusher (11) has a guide groove on its upper surface at the square hole, and a cleaning soft brush layer (19) is fixedly connected to the groove wall of the guide groove.

6. The online sand and gravel moisture content automatic monitoring device according to claim 4, characterized in that, The conductive rod (65) has a rubber ring (20) sleeved on its wall. The inner wall of the rubber ring (20) is fixedly connected to the outer wall of the energized block (66), and the outer wall of the rubber ring (20) is slidably connected to the inner wall of the air inlet cylinder (61).

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